Q-Lon Weatherseal

The Duraflex Diamond Suite - Making The Difference

Q-lon Gasket

Q-Lon Gasket

There are gaskets. Then there’s Q-Lon – it has excellent compression recovery of 99%, giving constant height at corners for improved weathering and does not produce weld sprue. Furthermore, it provides low operating forces on gearing which in turn ensures ease of operation for the user.

Weatherseal performance matters in windows, that’s why the Diamond Suite is supplied with Q-Lon pre-inserted into all sections.

The graph on the right shows the weather performance against competitor gaskets and demonstrates that Q-Lon provides less air leakage over a wide temperature range when compared to our competitors.

  • Operates perfectly in temperatures -20° to 70° with 99% memory recovery
  • Best acoustic and thermal performance across widest temperature range
  • 99% memory recovery. Retains shape year after year
  • Low operating forces reduce wear and tear
  • Leaves no rigid sprue after welding
  • Manufacturer lifetime guarantee
technical support

At Duraflex our experienced in-house support team provides a ‘one stop’ service for resolving your technical enquiries – from industry regulations and accreditation changes to product information.

  • Technical Assist dedicated Support Team
  • Assistance with factory layouts and planning
  • Wind loading calculations and advice
  • Accreditation, Regulations & Standards advice
  • In-house Thermal Calculations - fully approved simulators

We also have a dedicated team of mobile service engineers covering the UK and Ireland bring their expertise to suit your needs by providing tailored on-site support to assist your company.

technical support
technical support
technical support
technical support


Benefit from the ultimate Diamond Suite system range of profiles, supported with our complete fabricated product service.


High performing, multi-chambered range of window and door products - designed for today's consumer.


Be inspired with our complete marketing and sales support solution, designed to help grow your business.


Benefit from access and support from our industry leading experts. All here to support your business needs.


From the first meeting to your first day of production and beyond, our changeover team will be at your side.


We seek excellence in every aspect of business and set the same standards in our commitment to the environment.